Hoisting mechanism



June 10, 1930. G, 'H ILM N 1 ,763,600

HOISTING MECHANISM Original Filed 001:. 22, 1919 3 Sheec-Sheet 1 June' 10, 1930. a. H. GILMAN HOISTING MECHANISM Original Filed Oct. 22, 1919 3 Sheets-Sheet 2 June 10,1930. G.IH.GILMAN 1,763,500

HOISTING MECHANISM 7 Original Filed Oct. 22, 1919 5 s t s 3 :l WW "l,\\

Patented June 10, 1930 UNITED STATES PATENT OFFICE GEORGE H. GILMAN, OF GLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS HOISTING MECHANISM I Application filed October 22, 1919, serial My invention relates to hoisting mechanisms.

It has for its object to provide an improved pressure fluid actuated hoisting mechanism and one which is powerful in operation and" compact in form. A further object of my invention is to provide an improved hoisting mechanism having an improved-pressure fluid motor of the combined motor and speed reduction type which is adapted to be reversed and to enable reductions of widely varying degree to be obtained as desired. A still further object of my invention is to provide an improved and simplified pressure fluid actuated hoisting mechanism which is light, compact, and rugged, and adapted to use in varied relations as a winding drum or hoist, the same, however, being especially adapted to use as a mine hoist. These and 29 other objects and advantages of my improved construction will, however, hereinafter more fully appear.

In the accompanying drawings I have. shown for purposes ofillustration oneform which my invention may assume in practice, illustrating the same as applied to a winding drum or hoist such as a mine hoist.

In these drawings, Fig. 1 is a side elevation of a hoist em- 39 bodying my invention, certain parts being broken away or sectioned to facilitate illustration.

Fig. 2 is a longitudinal vertical sectional view of the construction shown in Fig. 1.

Fig. 3 is a transverse sectional view on line 3-3. of Fig. 2, illustrating one set of.

rotors.

Fig. 4 is a similar view on line 4-4: of Fig. 2, illustrating the other set of rotors.

Fig. 5 is a longitudinal sectional view on line 55 of Fig. 3, illustrating one set of pressure fluid connections.

Fig. 6 is a similar view on line 66 of Fig.

1, illustrating another set of the same.

Fig. 7 is a sectional view on line 77 of Fig. 2, showing certain of the throttle valve passages.

Fig. 8 is a sectional View on line 88 of Fig. 2, showing other valve passages.

Fig. 9 is a sectional View similar to Figs.

No. 332,519. Renewed October 16, 1929.

7 and8, showing the throttle valve in neutral position.

In this illustrative construction I have shown a winding drum 1, journaled on suitable bearings. 2. This drum is rotatable about a central shaft 3 which is in turn carried in suitable bearings 1, the parts being held in assembled relation by a clamping bolt 5 threaded into one end of the shaft at 6. The bearings 4 are carried by suitable arms 7,formed on any suitable support 8, herein in the form ofa trunnion adapted to be adjustably mounted and clamped as desired on a bar or otherwise, in the same general manner as a rock drill.

Disposed within the drum 1 and operative ly connected thereto in an improved manner, is my improved motor. The same is herein 'shown as enclosed within a suitable casing 9 arranged coaXially with the shaft 3 and retatable relative thereto on suitable bearings 10 disposed at opposite ends of the casing. As shown, this casing houses a plurality of sets of rotors, one set being rotatable about a fixed gear and carrying with-it the other set of rotors, which themselves rotate at a materially reduced speed a rotatable gear connected to the drum. Accordingly the construction is such that each set of rotors cooperates with the other, not only in the rotation of the drum but in producing the speed reduction desired. 7

Referring more particularly to the drawings, Figs. 2 to .41, it will be noted that a fixed gear 11 is disposed within one end of the casing 9 and suitably keyed to the shaft 3, as at 12. A plurality of smaller gears or rotors 13 having a smaller number of teeth than the gear 11 are arranged about the gear 11 in mesh with the same, the rotors 13 being snugly housed in suitable bosses on the casing 9. Each rotor 13 is herein suitably splined, as at 14:, to a suitable shaft 15 disposed longitudinally of the casing and journaled therein in suitable bearings 16 at oppo- 95 site ends of the casing. I-Iere, attention is also directed to the fact that the shafts 15 are provided at points substantially midway between, their ends with spacing flanges 17;

and that the same carry on the opposite side 10L of the flanges 17 from the gears 13, another set of rotor gears 18 having a larger number of teeth than the gears 13, and similarly splined, at 19, to the shafts. These gears 18 in turn mesh with an axially located rotatable gear 20 having a largernumberio'f teeth than thegears 11, 13, and 18. The-'gear20 is keyed, as at 21, to a sleeve shaft 22 rota-table on the shaft 3-. andherein aformedsintegralh. with an end member 23 0f the-drum 1,1whiclt end member is normally rigidly connected to the drum by screws 24.

We will next consider the motive fluid connections tolth'eirotorsr Here, it'will. bernoteda that pressure fluid, preferably laden with lubricant; is supplied to the'device fronra suitable line 25 through a throttle val've 261- This valve 26"is int'turacontrolledbye-usual controlhandl-e "27; andiherein has .'.a central I chamber 28adapted to supplyunoti-ve fluid from the line alternatively througl'r'eitherof superimposed *ports '29 to-the "corresponding"; passages 30 or 31 disposed longitudinally of the sh aft'3. The .valveis also providd with a pair: of "'superiiiiposed Zperipheral' "passages or-ports 32:adaptedhlternatively'to establish" communicati'ombetweenithepassages 3O or31. and a downwardly"disposedexhaust portor= passage 33fdrm'ediri the valve .casing: Thus it will also be noted that thexva'lve'is made reversible iandadapted, whenits "handle is in the "position Al-illustrated 'in' Figs: 7 and" Sto supply fluid to the passage "30 'and'receive ex; haust"fr om the passage31, while-when init's' 35 position B illustrated in' those figuresit is adaptedto supply fluid tothe passage 3 l-and receive exhaust from the passage -30,"neither passage receivingm'otive fluid whenthexvalve' is in its intermediate 'or'neutral positioniC illustrated. VV'e twill firstconsiderthe 'p res-' sure fluid connections when" 'fiuidis supplied through the passage 30; Here, it .will' 'be ob served Figsr5 and 6) that the fluid enteringf through" the passage :80 passes .out through ports '35 communicating with the passage "30,

into a n" annular passage '36 formed "in"on'e 'of" the bearings 10 of the 'casin'g 9,"an'd that from this annular. passage? the pressure" fluid is. supplied ith rough ports or passages 3710' -Iongitudinallywlisposed 'passages 38: These-e passages '38 are formed -in those portions of" the casing 9 which are adj acentthe teethofthe gears 11 and 20." As the setsof .rotors 13, 18, are both mounted on'the shafts 15, each 13 and a rotor-18; and "is adapted to "supply: motive fluid' through distributing ports 39' thereto at 'a'plurality; of points along: their le'ngthand substantially opposite their. line no of mesh with their" cooperatinggstationary;

" teri'or; which iirturn communicates with the atmosphere through exhaust ports 41 formed in the drum end 28. Here it will also be noted that the exhaust from the gears 11 and 20 passes out through ports and passages 42, 13,

corresponding to the ports and passages 39,

passages 38, while when'the valveis'indt-s neutral position (Fig; 9) no air-will flowto the 'motor.

Inth'eoperationof my improved construe tion, it will 'be observed that, when'motive fluidis'admitted through the passages 38 and ports-39or through the passages4-3 and ports 42*,the gears 13 will be caused to rotate about theiraXes-and bodily about the fixed gearill,

thereby producing a rotation ofthecasing-Qlf At'the same time it will be noted that-air'is also: admitted through the ports" 39"-to thegears-18. These gears, as they thusbodily rotate W-Ith'the casing, are also caused to rotateabouttheir own axes; and due to the dif ferencein the number of teeth on the various gears the rotatablegearQO and the connecteddrum l-are driven in a direction opposite to: the direction of rotationof the casing and'at amateriallyreduced speed. The reductionin speed isdependent upon the nun'iber'ofteeth employed in the different sets of gearsand the-arrangementof the gears. For example, it has been found possible in my present con'-' struction, by merely varying the gears, i.:,e. using gears having different-numbers of teeth, to produce' twelve different speeds and' a re'- ductionvarying from lO'to 1 to 174 to 1, while utilizing the same casing; and it will, of

course, be understood that'by the use of casings'of different sizes even further variations may be obtained within the'same drum". Here 7 attention'is also directed to the fzictthatit has been discovered that by interchanging the setsof'gears, as, fo1"instance,-by inter-.

changing gear ll'with gear 20 and the gears"- 13 with gears 18, it is possible to obtain'a reversal of rotation. It has also been found that by simply throwing the controlhandle 27 into its neutral position" it is possible to lock the drum inan'y desired position, this arising from the fact that the reduction is so great that the-reduction mechanism acts substantially as does a Worm and worm gear, todock the parts in-any desired position. Due to'this self-lockinggfeature there is nonecessity for theuse of additional braking mechanism.

Asa result of improved construction wherein the entire mechanism is carried within the drum, it will be obser'vedthat avery light, powerful, and compact mechanism is produced, and one which, while adapted to use in other relations, is especially adapted touse as a winding drum or hoist.

More specifically, it has been found that through my improved construction it has been possible to reduce by substantially fifty per cent, the weight of a winding mechanism fact that in .my improved construction;

whereinit is possible to vary the number of speeds obtainable, I am thereby'enabled to meet various conditions encountered in practice, with great facility. These and other advantages of my improved construction will, however, be clearly apparent to those skilled in the art.

IVhile I have in this application spec-iii cally described one form which my invention may assume in practice, it will be understood that this form is shown for illustrative pur poses and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims. 7

What I claim as new and desire to secure by Letters Patent is:

1. In a hoist, a shaft, a windingdrum rotatably mounted thereon, a reversible pre sure fluid motor comprising 1 compound motor and reduction gearing carried on said shaft and housed within said drum, means for supplying pressure fluid to. said motor to act on the teeth of said motor and reduction gearing, means for exhausting fluid from said motor, said supply and exhaust means including passages disposed. within said shaft substantially axially of said drum,

means for reversing said motor and drum including a reversible controlling valve carried at one end of said shaft, means for bold ing one of said gears against rotation, and means connecting another of said gears in operative driving relation with said drum.

2. In a hoist, a central stationary shaft, a

winding drum rotatably mounted thereon, a bearing member carried by said drum, a

pressure fluid motor housed within said drum and comprlsing motor and reduction gearing carried on said shaft, said motor havin a casin ournaled' at one end onsaid b D J bearing member and at the other end journaled on said shaft, means for supplying pressure fluid to said motor to actfon the teeth of said motor and reduction gearing,

means for exhausting fluid from said motor,

said supply and exhaust means including longitudinally disposed supply and exhaust passages formed in said-shaft, supplemental eXhaust'ineans for said motor in said drum, means'for securing one ofs'aid gears to said shaft, and means connecting another of said gears in operative driving relation with said drum. 7 p

' 3.In a hoist, a winding drum, a pressure fluid motor housed within said drum and comprising motor and reduction gearing, a sleeve connected-to oneof the gear elements thereof, a shaft extending through said motor and sleeve, said drum being journaled on saidshaft, means for supplying pressure fluid to said motor-to act on the teeth of said motor and reduction gearing, means for exhausting fluid from'said motor, and means connecting said sleeve to-said drum l. In a hoist, spaced supporting standards, a stationary shaft connected to each of the same," a winding drum rotatably mounted on said shaft, an annular bearing member rigidly connected thereto and disposed concentrioally with said shaft, a gear secured to said bearing member, and driving means for said drum carried by said shaft including reduction gearing meshing with said first mentioned gear andv supporting means for said reduction gearing rotatably mounted on said bearing member.

5. In a hoist, spaced supporting standards, a stationary shaft connected thereto, a winding drumdisposed between said standards and rotatably mounted on said shaft, saiddruin having a sleeve member rigidly connected thereto and disposed about said shaft,and gearing for driving said drum disposed within the drum and including a gear supported on said sleeve, 2 second gear disposed coaXially therewith, and a train of gear ing connecting said coaXially disposed gears. 6. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formedtherein, a pressure fluid motor disposed within said drum comprising intermesliing motor gears, means including said shaft for supplying pressure fluid to act on the teeth: of said motor gears, means for exhausting fluid from said motonnieans for holding one of said motor gears against rotation, means forming a part of said motor for rotatably supporting the remaining gears, and means including transmission gearing connecting another of said motor gears in operative driving relation with. said drum, one of said transmission gears being directly connected to said latter motor gears so as to berotated directly thereby and also rotatable relative to said motor gear supporting means.

7. In a hoist, a stationary shaft, a winding drum rotatably mounted on said shaft, a pressure fluid motor disposed within said drum comprising intermeshing motor gears, one of said gears being fixed against rotation relative to said shaft, means forming a part of saidmotor for rotatably supporting the remaining gears, means for supplying pressure fluid to act on the teeth of said motor gears, means for exhausting fluid from saidmotor, and means including transmission gearing connecting another than theyfixed gear of said motor gears in operative driving relation with said drum, one of saidtransmission gears being directly connected to said latter motor gears so astobe rotated directly thereby and also rotatable relative to saidmotor gear supporting means.

8. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressuresfluid motor disposed within said drum comprising intermeshing motor gears, means for supporting certain of. said gears for rotation on axes offset from and disposed on opposite sides of a plane including the drum axis, means includingsaid shaft for supplying pressure fluid to act on the teeth of saidmotor gears, means for exhausting fluid from said motor, means for holding one of said motor gears against rotation relativeto said shaft, and means including transmission gearing for connecting another of said latter motor gears in operative driving relation with said drum, one of said transmission gears being directly connected to said latter motor gears so as to be rotated directly thereby and also rotatable relative to said motor gear supporting means.

9. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressure-fluid motor disposed within said drum comprising intcrmeshin g motor gears, means for supporting certain of said gears forrotation on axes offset from and disposed on opposite sides of a plane including the drum axis, the axes of said latter motor gears sweeping through surfaces of revolution as said drum rotates, means including said shaft for supplying pressure fluid to act on the teeth of said motor gears, means for exhaustingfluid from said motor, means for holding one of said motor gears against rotation relative to said shaft, and means includingtransmission gearing for connecting another of said latter I motor gears in operative driving relation with said drum, one of said transmission gears being directly connected to said latter motor gears so as to be rotated directly there by and also rotatable relative to said motor gear supporting means.

10. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressure fluid motor disposed within said drum comprising intermeshing motor gears, means for supporting certain of said gears for rotation on axes offset from and disposed on opposite sides of a plane including the drum axis, the axes of said latter motor gears sweeping T through surfaces of revolution in a direction opposite from the direction of drum rotation as said drum rotates, means including said shaft for supplying pressure fluid to act on the teeth of said motor gears, means for exhausting fluid from said motor, means for holding one ofsaid motor gears againstrotation relative to said shaft, and means including transmission gearing for connecting another of said-latter motor gears in opera tivedriving relation with said drum, one of said transmission gears being directly connected to said latter motor gears so as to be rotated directly thereby and also rotatable relative to said motor gear supporting means.

11. In a'hoist, a winding drum, a pressure fluid. motor disposed within said drum comprising intermeshing motor gears a plurality of which are arranged coaxially with the drum axis, means for supplying pressure fluid to said motor to act on the teeth of said motor gears, means for exhausting fluid from said motor, and means for holding one of said coaxial motor gears against rotation, another of said coaxial motor gears being fixed against rotation relative to said winding drum.

"12. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressure fluid motor disposed within said drum comprising intermeshing motor gears, means for supporting'certain of said gears rotating on axes offset from and disposed on opposite sides. of a plane including the drum axis, the axes of said latter motor gears sweeping through surfaces of revolution as said drum rotates, means including said shaft for supplying pressure fluid to said motor to act on the teeth of said motor gears, means for exhausting fluid from said motor, and means including transmission gearing for connecting one of said offset motor gears in operative driving relation with said drum, one of said transmission gears being directly connected to: said latter motor gears so as to be rotated directly thereby and also rotatable relative to said motor gear supporting means.

13. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressure fluid motor-disposed within said drum comprising intermeshing motor gears, means for supporting certain of said gears rotating on axes offset from and disposed on opposite sides of a plane including the drum axis, the axes of said latter motor gears sweeping through surfaces of revolution in a direction opposite to the'direction of drum rotation as said drum rotates, means including said shaft for supplying pressure fluid to said motor to act-on'the teeth of said motor gears, means for exhausting fluid from said -motor, and means including transmission gearing for connecting one of said oflset motor gears in operative driving relation with said drum,

vone of said transmission gears being directly supporting said drum comprising a shaft hav ng a passage formed therein, a pressure fluid motor comprising compound motor and reduction gearing carried on said shaft and housed within said drum, means including said shaft for supplying pressure fluid, to

said motor to act on the teeth of said motor Y and reduction gearing, means for exhausting fluid fromsaid motor, means for holding one of said gears against rotation, and means connecting another of said gears in operative driving relation with said drum.

15. In ahoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressure fluid motor comprising compound planetary motor and reduction gearing carried on said shaft and housed within said drum, means including said shaft for supplying pressure fluid to said motor to act on the teeth of said motor-and reduction gearing, means for exhausting fluid from said motor,.means for holding one of said gears against rotation, and means connecting another of said gears in operative driving relation with said drum.

16. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressure fluid motor housed Within said drum and comprising motor and reduction gearing, an operative driving connection between said motor and drum comprising a sleeve extend ing within said motor, a gear of said gearing being secured to said sleeve, means including said shaft for supplying pressure fluid to said motor to act on the teeth of said motor and reduction gearing, and means for exhausting fluid from said motor.

17. In a hoist, a winding drum, a pressure fluid motor housed within said drum comprising motor and reduction gearing includ ing coaxially arranged gears, a shaft supported for orbital movement about said coaxially arranged gears, and other gears mesh ing with said coaxially arranged gears and secured to said shaft, means for supplying pressure fluid to said motor to act on the teeth of all of said gears, means for exhausting fluid from said motor, and means connecting said gearing to said drum.

18. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressure fluid motor housed Within said drum and comprising a casing and motor and reduction gearing disposed wthin said casing, said casing being rotatable relative to said drum, means including said shaft for supplying pressure fluid to said motor to act on the teeth of said motor and reduction gearing, means for exhausting fluid from said motor, and means connecting said gearing to said drum.

' 19. In a hoist, a winding drum, a pressure fluid motor housed within said drum com prising motor and reduction gearing including coaxially arranged gears, a shaft supported for orbital movement about said coaxially arranged gears, and other gears meshing with said coaxially arranged gears and secured to said shaft, means for supplying pressure fluid to said motor to act on the teeth of said gears, means for exhausting fluid from said motor, means for holding one of said coaxial motor gears against rotation, and means connecting another of said coaxial motor gears in driving relation with said drum.

20. In a hoist, a winding drum, means for supporting said drum comprising a shaft having a passage formed therein, a pressure fluid motor housed within said drum and comprising a casing supported for rotation relative to said drum, and motor and reduction gearing disposed within said casing, said gearing including gears arranged coaxially with said casing, and other gears meshing with said coaxial gears and rotatably mounted in said casing, means including said shaft for supplying pressurefluid to said motor-to act on the teeth ofsaid motor and reduction gearing, means for exhausting fluid from said motor, means for holding one of said coaxial gears against rotation, and means connecting another of said coaxial gears in driving relation with said drum.

, 21. In a hoist, a winding drum, a pressure fluid motor disposed within said drum comprising intermeshing motor gears, operative driving connections between said motor and drum including a shaft disposed coaxially with said drum, a gear secured to said shaft to, and a plurality of intermeshing fluid pressure operated motor gears arranged within said casing, means including said shaft for supplying pressure fluid to said motor to act on the teeth of said motor gears, means for exhausting fluid from said motor, and means for connecting said motor in operative driving relation with said. drum comprising a second shaft mounted for rotation relative to said motor casing and projecting within the same and having a gear carried thereby and disposed within said motor casing for effecting drum rotation. V

23. In a hoist, a winding drum, means for supporting said drum comprising a shaft having. a passage formed therein,'a pressure fluid to said motor to act on the teeth of said motor gears, means for exhaustin g fluid from said motor, and means for connecting said motor in operative driving relation with sa1d drum comprising a second shaft mounted for *rotation relative to said motor casing and projecting within the same and carrying a 1 reduction gear.

1 24;. In a hoist, a winding drum,'means' for supporting said drum comprising a shaft'having a passage formed therein, a pressure fluid motor disposed within said drum comprising a motor casing arranged. ooaxiallvwith said drum and. rotatable relative thereto, and: a plurality of intermeshingfiuid pressure operated motor gears arrangedwithin said casing, means lncluding saidshaft for supplying pressure fluid to said motor-to act on the teeth of sa1d motor gears, means forexhausting fluid from said motor, and 'means for oonnecting said motor in operative driving relation with said drum comprising a second shaft secured to said drum and carrying one of said motor gears.

25. In a hoist, a Winding drum,"meansfor supporting said drum comprising a stationary shaft, a motor housed within said ldrum, said motor comprising a casing rotatable relative to said shaft,-and motor and reduetion gear rotors disposed in said casing, said motor and reduction gear rotors constituting epicyclic gearing, oneof said gear rotors being fixed against n'o-tation relative to said shaft, and a member"connectingsaid motor in driving relation with said drum, said member being rotated by said, epieyclic gearing in the opposite direction'fron'l said casing. Y

26. In a hoist, a winding'drum,.means for a supporting said drum comprising an element extending within the same, a motor disposed Within sa1d drum having a casing rotatable 'lBlfltlVGztO sa1d drum, :and means'foroonnecting said motor in operative: driving relation with said drum comprising a member secured to said drum and projecting into said imotor, said casingbeing supportediat one end on said element and at the otherv end on said member.

127. In a hoist,- a Winding. drum,means for supporting said drum comprisinga shaft extending through. the same, a motor disposed Within said .drum having a casing rotatable relative to said drum, and means for connect- :said casing being supported ratcone end on said shaft and at the other end on said sleeve.

therein, said' motor-comprising'intermeshin'g. l

- gear rotors; certain 6f said 'gear 'rotorsjrotating' on: axes offset-fromaanddisposedon oppositesi'des ofaplane including the drum "axis, means including said shaft for supplyin gqaressure fluidto'act on the teethof "said'gearrotors, meansfor exhausting-"fluid from said motor; and means "for-producing 'rotation-of saiddrumby saidunotor including "a sleeve coaxial-with said drum-and having fixed thereto at its inner'enda gear driven'a by said'motor.

29. In a hoist, a winding drum,-'-and-'means for "rotating the: 'samemmnpi'ising a motor easing dis-posedavitliin-psaid drum and To- "tatable relativethereto'ontheanis thereof,

: intermeshing motor igears d-ispose'd within said casing, certain er said gears rotating on axes oifset from and disposed on opposite sides (iif'mf plane in'c'lifding the vdrum ea'xis,

means fol-supportingsaid motor'casing com- 139 piising ashaft hari-ng a-"passa-ge therein for supplying pressure 'fluid' to-act'on the teetlrof said motor gears, ashaft carrying "one "of said latter'motor'gearsalidsecurd t-heretoya seeond gear secured-to said'shaft; andzasleeve icoaizial with said "drum "and having fixed thereto at its inner end a gear driven "by said lastz'mentioned gear.

30. In a hoist; a" windin'g drum; means forrotating thetsame 'comprisinga pressure 'fiuid motor disposed "within said drum, "a

motor drivenshaftcoaicial'twitlr'said drum disposed at oneendof'said'motor, astationary condt'u't" element coaxial-withsaididrum,

said ele11'1ent;bein'g formedtwithsupplyand eirh aust passages, and awalvefor' controlling said passages, said'va'lve being"'a'dapted to reverse said motor byint'erchanging thejconne'ctions to; exhausttand. supp ly, said -motor comprising a central'motor gear;a'shaft para'll'el thereto and havingfixed theretoa-motor gear ,meshing with saidrentral' motor gear, another j gear secured to saidgparallelthaft,

1- and a gear meshing therewithxand' secured to said driven shaft.

In testimony wheredf I affiximy: signature.

" GEORGE 'H. GIEMAN. 

